{"product_id":"2026-britannia-mint-error-struck-on-cupro-nickel-5-planchet-instead-of-silver-ngc-ms68","title":"2026 Britannia Mint Error | Struck on Cupro-Nickel £5 Planchet Instead of Silver | NGC MS68","description":"\u003cdiv class=\"product-description\"\u003e\n\u003cp\u003eThis is a genuine, Royal Mint-confirmed minting error: a 2026 1oz Britannia struck using blanks intended for base-metal £5 crown coins, rather than the correct .999 fine silver rounds. The mix-up went undetected during production, and a small number of these off-metal strikes were distributed to a Royal Mint supplier before the error came to light. It is understood that only 209 of these coins exist.\u003c\/p\u003e\n\u003cp\u003eVisually, the coin is identical on both sides to a standard 2026 1oz Silver Britannia — the same reverse design and the same uncrowned obverse portrait of King Charles III by Martin Jennings — but struck on a cupro-nickel planchet rather than silver. Cupro-nickel is the copper-and-nickel alloy The Royal Mint typically reserves for its base-metal commemorative crown releases, and the coin carries no silver or precious metal content whatsoever. Its value lies entirely in its rarity and documented origin as a genuine mint error, not in metal content.\u003c\/p\u003e\n\u003cp\u003eThe cupro-nickel composition on this example has been independently confirmed using in-house XRF (X-ray fluorescence) technology, adding a further layer of verification beyond the coin's NGC certification.\u003c\/p\u003e\n\u003cp\u003eGraded \u003cstrong\u003eNGC MS68\u003c\/strong\u003e and encapsulated with the \"Mint Error\" designation on the label. NGC's highest confirmed grade for this error type to date is MS69, making this an exceptional example just one point below the current ceiling for the entire error population.\u003c\/p\u003e\n\u003ch3\u003eCoin Highlights\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Royal Mint-confirmed minting error, struck on a base-metal £5 cupro-nickel planchet instead of .999 silver\u003c\/li\u003e\n\u003cli\u003eOnly 209 examples understood to exist\u003c\/li\u003e\n\u003cli\u003eIdentical design to the standard 2026 1oz Silver Britannia on both sides\u003c\/li\u003e\n\u003cli\u003eComposition independently verified by XRF technology\u003c\/li\u003e\n\u003cli\u003eObverse: uncrowned portrait of King Charles III by Martin Jennings\u003c\/li\u003e\n\u003cli\u003eGraded NGC MS68 with the official \"Mint Error\" label designation\u003c\/li\u003e\n\u003cli\u003eNGC's highest recorded grade for this error is MS69 — this example sits just below the current ceiling\u003c\/li\u003e\n\u003cli\u003eEncapsulated in a tamper-evident NGC holder for authenticity and protection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eYear\u003c\/td\u003e\n\u003ctd\u003e2026\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMint\u003c\/td\u003e\n\u003ctd\u003eThe Royal Mint, Llantrisant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eComposition\u003c\/td\u003e\n\u003ctd\u003eCupro-nickel (error — should be .999 fine silver)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e38.61 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObverse Designer\u003c\/td\u003e\n\u003ctd\u003eMartin Jennings (King Charles III, uncrowned portrait)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReverse\u003c\/td\u003e\n\u003ctd\u003eStandard 2026 Britannia design\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKnown Population of This Error\u003c\/td\u003e\n\u003ctd\u003eApproximately 209\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrading\u003c\/td\u003e\n\u003ctd\u003eNGC MS68, Mint Error designation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHighest Known Grade for This Error\u003c\/td\u003e\n\u003ctd\u003eMS69\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eWhy This Coin Stands Out\u003c\/h3\u003e\n\u003cp\u003eGenuine, verified mint errors from The Royal Mint are rare events — this is a documented case with corroboration across multiple sources, an official Mint acknowledgement, and independent XRF metal verification, which is considerably more assurance than most error coins ever receive. With only 209 known examples and a grading ceiling of MS69, this NGC MS68 example represents a near-top-tier grade within an already tiny population. A genuinely unusual and highly collectable piece for anyone interested in modern British minting errors.\u003c\/p\u003e\n\u003cp\u003eAs UK legal tender, this coin is exempt from Capital Gains Tax for UK residents regardless of its composition. Browse our full range of \u003ca href=\"https:\/\/www.sovaracoins.com\/collections\/buy-graded-sovereigns\"\u003egraded gold Sovereigns\u003c\/a\u003e to explore more rare and unusual certified coins.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.ngccoin.uk\/certlookup\/8467231-006\/68\/\" rel=\"noopener\" target=\"_blank\"\u003e\u003cspan\u003e2026 G.Britain Britannia On £5 Cu-Ni Planchet S2PND\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"Royal Mint","offers":[{"title":"Default Title","offer_id":60619167793486,"sku":"2026-britannia-mint-error-cupro-nickel-planchet-ngc-ms68","price":4130.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0853\/9370\/3246\/files\/2026-britannia-mint-error-cupro-nickel-planchet-ngc-ms68.webp?v=1788271310","url":"https:\/\/www.sovaracoins.com\/products\/2026-britannia-mint-error-struck-on-cupro-nickel-5-planchet-instead-of-silver-ngc-ms68","provider":"Sovara Coins LTD","version":"1.0","type":"link"}